Machine for operating upon sheet material



Jan. 10, 1939. F. CORSON 2,143,185

MACHINE FOR OPERATING UPON SHEET MATERIAL 'Filed Nov. 20, 1956 Patented Jan. 10, 1939 UNITED STATES PATENT OFFICE MACHINE FOR OPERATING UPON SHEET MATERIAL Application November 20, 1936, Serial No. 111,886

8 Claims.

This invention relates to machines for operating upon sheet material and is herein illustrated as embodied in a machine for pinking or forming notched edges on shoe part blanks such as tips.

lit has long been common practice to pink or serrate edge portions of shoe part blanks such as tips to provide finished blanks having decorative edge portions. It is an object of the present invention to provide an improved pinking machine Which Will be operative to form a pinked edge which is beveled, thereby to heighten the decorative effect. To this end, and as illustrated, I have provided in a machine of the type referred to a pinking tool having a V-shaped cutting edge and a beveled Work engaging face adjacent the edge so constructed and arranged that as the tool is brought down upon the work and penetrates it the tool will be moved laterally, thereby to form in the work a V-shaped notch having beveled side portions. Preferably and as shown, the tool is carried by a slide which is movable laterally relatively to a tool carrier during a cutting operation, and is returned to its original position after a cutting operation by means of a spring. Preferably too, the carrier is provided with a depending member adapted to engage a portion of the work to be removed by the pinking operation for advancing the work past the tool between successive cutting operations thereof.

This machine is advantageous in that it is simple in its construction and operation and in that the tool is effective rapidly and accurately to form a beveled pinked edge. Furthermore, since the member for feeding the work engages a portion of a blank to be cut off by the pinking operation, the finished blank is not marred by the feed member.

These and other features of the invention are disclosed in the accompanying drawing, are set forth in detail in the specification, and will be pointed out in the claims.

In the drawing,

Fig. 1 is a perspective view of a perforating machine provided with a pinking attachment constituting a preferred embodiment of my invention;

Fig. 2 is an enlarged side view of the pinking attachment;

Fig. 3 is an enlarged vertical cross section through the pinking tool attachment;

Fig. 4 is an enlarged bottom plan view of the pinking attachment; and

Fig. 5 is an enlarged plan view of a portion of a blank upon which the pinking operation has been partly performed.

Fig. 1 illustrates a perforating machine of the type disclosed in United States Letters Patent No. 1,580,132, granted April 13, 1926, upon an application filed in the name of Perley R. Glass. This machine comprises a frame carrying a work table i2 and a head It in which is mounted a plunger it arranged for reciprocation in a heigl'itwise direction and for movement back and forth along the table, there also being a work gage i8 and an intermittently operated presser foot 28. The plunger It has at its lower end a tool holder 22 having a dovetail slot 24 adapted for the reception of a tool carrier, in the present instance, a carrier 26 for a pinking tool 28. For further details of construction and operation of the machine thus far described, with the exception of the pinking tool, reference may be had to the aforementioned Letters Patent.

The pinking tool 28 has two beveled work engaging faces 30 (Figs. 2, 3 and 4), which lie in planes extending at an inclination to each other, and which terminate in a notch 32 to form a V-shaped cutting edge 36. The purpose of the beveled faces is to force the tool laterally of the work as it penetrates the work thereby to form a notch such as notch 35 in a tip blank 36 (Fig. 5), the sides 31 of which are beveled. The tool 28 has a shank portion 38 which is secured to a slide it mounted for lateral movement relatively to the carrier 26. The carrier comprises a body portion 12 and a cover plate 44 which are secured together by screws 46 and 48 and a plate 50 secured to the body portion 42 by a screw 52 and a dowel 53. The slide is held in position in the carrier by shoulders 54 and 56, respectively, on the body portion 42 and plate which engage projections 58 on the slide.

Preferably and as shown, the movements of the slide 40 are facilitated by roller bearings 60 located in a cavity 62 in the body portion 42 and adapted to engage the upper surface of the slide 48. The bearings are retained in position against substantial lateral movement by a U-shaped retaining plate 64. Lateral movement of the slide is limited by a projection 66 which extends upwardly into the cavity 62 and in its extreme positions, one of which is illustrated in Fig. 3, engages a leg of the plate 64 which has been forced against one of the bearings 60. The carrier is shaped to fit the dovetail slot 24 in the tool holder 22 and is retained therein by a screw 68. In order to return the slide to its original position after a cutting operation of the tool there is provided a (iii spring I0 secured to the plate by a screw 12 and bearing against the screw 52, one end of the spring being arranged to enter an opening I4 in the tool.

In order to feed the work I have provided a pin 16 projecting downwardly from the body portion 42. The pin 16 is adapted to penetrate the work outwardly of the line of contact of the tool with the work as indicated at 18 (Fig. 5), and, as the plunger I6 is moved rearwardly of the machine, the Work will be advanced past the tool after each cutting stroke. As shown in Fig. 1, the work, such as the tip 36, is guided relatively to the tool by the gage H] which engages an edge portion of the blank in advance of the tool, the work being held down upon the table l2 during a downward movement of the plunger by the presser foot 20.

In the operation of the machine a shoe part blank such as a tip 36 is moved inwardly over the table I2 into position beneath the tool 28 which is moved downwardly by the plunger i6, the work being held in fixed position by the presser foot 20. As the cutting edge 34 enters the wo'rli to form' a V-shaped notch therein, the faces 3110f the tool en age the material and, because of the bevel thereon, force the tool and slide 453 to the right as viewed in Fig. 1, resulting in the forming of a notch'having beveled edge portions. During the descent of the tool the pin '76 enters the Work outwardly andin advance of the notch being formed, andwhen the plunger is oscillated rearward-ly of the machine, as the tool rises from the Work, the pin advances the work across the table'b'ya distance equal to the width of a notch,

1 the feeding operation the plunger moves forwardly andthen' down after which the cycle of operations is repeated until the portion 80 of the blank is 'completely severed from the body portion of the blank. The operation results in a finished blank' provided with a pinked or notched edge whereinthe side walls of the notches are beveled.

Having described my invention, what I claim as newand desire to secure by Letters Patent of the Unite'd States is:

1. In a machine for operating upon shoe part blanks, a work table, a tool carrier movable heightwiseof and along the table, and a tool mounted in the carrier for movement laterally thereof and having a beveled work engaging face terminating in a cutting edge, said beveled face causing lateral movement of the tool upon penetration of w'ork'positione'd upon the table to produce a beveled cut in the work.

2. In a machine for operating upon shoe part blanks, a tool carrier, a slide mounted for movement laterally of the carrier, a tool secured to the slide and having a beveled work engaging face terminating in-a cutting edge, and a work feed member comprising a projection depending from the carrier at a point located in advance of the slide.

3. In a machine for operating upon shoe part blanks, a tool carrier, a slide mounted upon the carrier for movement laterally thereof, and a tool secured to the slide and having outwardly disposed beveled Work engaging faces terminating in a V-shaped cutting edge'a'nd being constructed and arranged to cause lateral movement of the slide as the tool penertates the work thereby to produce a beveled cut.

4. In a machine for operating upon shoe part blanks, a tool carrier, a slide mounted upon the carrier for movement laterally thereof, a tool positioned upon the slide and having a beveled work engaging face terminating in a cutting edge, said beveled work engaging face being constructed and arranged to cause lateral movement of the slide upon penetration of the work by the cutting edge, and a spring upon the carrier normally operative to maintain the slide in predetermined position relatively to the carrier.

5. ma machine for operating upon shoe part blanks, a tool carrier, a slide mounted in the 3 carrier for movement laterally thereof, a tool secured to the slide, anti-friction bearings mounted in a cavity in the carrier and con structed and arranged to receive the thrust of the tool, and a projection upon the slide extending into the cavity for limiting lateral movement of the slide.

6. In a machine for operating upon shoe partblanks, a table, a tool c'arriermounte'd for movement along the table and heightwise thereof,-

means upon the carrier for feeding work across the table, a slide on the carrier movable at right angles to the line of feed of the work, and a tool carried by the slide and having a beveled cutting edge terminating in a notch the axis of which blanks, a table, a tool carrier movable along the table and heightwise thereof, means on the tool carrier for feeding work positioned upon the table, means for engaging edge portions of the work to guide the same during feeding movement thereof, a slide upon the carrier movable transversely of the line of feed of the edge portions of the work under control of the guide, and a tool mounted upon the slide and havingbeveled faces terminating in a V-shapedcutting edge the open end of which faces toward the line of feed. FRED L. CORSON. 

